Lawn burweed is a serious problem in warm-season golf courses, sports fields, and residential turfgrass. Field studies were conducted at three sites in Florida to evaluate herbicides applied postemergence for control of lawn burweed. Mecoprop + 2,4-D + dicamba provided > 95% control of lawn burweed when evaluated 47 to 55 d after treatment (DAT). MCPA + triclopyr + dicamba in either ester or amine forms, 2,4-D + triclopyr + dicamba, triclopyr, 2,4-D, and bromoxynil provided 88 to 100% control 40 to 55 DAT. Although triclopyr + clopyralid provided > 90% control in one study, it was not consistent and controlled < 75% of the lawn burweed present in another experiment. Simazine was unacceptable for lawn burweed control. Bermudagrass turf was not injured by any of the treatments evaluated. Mecoprop + 2,4-D + dicamba caused minimal short-term injury to centipedegrass.
